// 数据库的连接
// const dbUserName = "epidemic";
// const dbPassWord = "flying_dark_feather";
// const targetDataBase = "epidemic";
// //
// const url = `mongodb://${dbUserName}:${dbPassWord}@8.136.14.176:2700/${targetDataBase}`;
// const { MongoClient } = require("mongodb");
// const client = new MongoClient(url);
// connection = (async function () {
//   await client.connect();
//   return client.db("epidemic");
// })();
// function closeConnect() {
//   client.close();
// }
// module.exports = { connection, closeConnect };
